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《Journal of Shandong Institute of Physical Education and Sports》 2012-05
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Exercise preconditioning on cerebral cortex after exhaustive exercise in micro-structure and metabolism of free radicals

WEI Cui-lan1,YUAN Qiong-jia2 1.School of P.E.,Chengdu University of Technology,Chengdu 610059,Sichuan;2.Chengdu Sport University,Chengdu 610041,Sichuan,China  
Objective:In this study the establishment of SD rat model and a one-time pre-movement model of exhaustive exercise,by observing the micro-structure of rat cerebral cortex,ultrastructural changes,and indicators of exercise tests on a one-time pre-exhausted cerebral cortex caused by lack of blood-reperfusion injury protection mechanisms,in order to provide a scientific reference for exercise training.After adaptive feeding for 1 week,70 four-month-old SD male rats were randomly divided into three major groups :the control group(C group),a one-time exhaustive group(E group),exercise preconditioning group(EP group).C group and E group were fed 6 weeks routinely,while EP group were pretreated 6 weeks by intermittent training.6 weeks later,all groups except C group took an exhaustive swimming training,and separately selected sampling instantly,24 hours,48 hours after training.SOD,GSH-PX activity and MDA levels of rats cerebral cortex were detected,and rat cerebral cortex micro-structure and ultrastructure observed in deferent time by sections.Results: ①Compared with C and E group,SOD and GSH-PX activity of EP group were obviously higher at deferent time points,especially very significantly higher than the other groups(P0.01)at instant time.While SOD and GSH-PX activity of E and EP group decreased significantly at the second time point(P0.01) and obviously increased again at the third time point(P0.05).Compared with EP group,MDA content of E group was no obviously different,while MDA content of E group was higher.②Rat cerebral cortex micro-structure and ultrastructure : The injuring of neuron nucleus and mitochondrion those in EP group were all smaller than in E group at each time point,which indicated that high-intensity interval training can be effective in preventing a result of a one-time exhausted cerebral ischemia-reperfusion injury and enhance the body's ability to get rid of free radicals.
【Fund】: 国家自然科学基金(30971418)资助
【CateGory Index】: R87;G804.7
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